B1655

Code

Other B — Body

Seat Driver Rear Up Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 21 EN: 34 RU: 22

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Page language: EN

Causes

Open or shorted wiring in the driver seat rear up circuit
Faulty seat position/switch assembly (rear up function)
Failed seat motor/actuator for rear up/tilt
Poor or corroded connector or pin at the seat harness or control module
Tripped/blown fuse or faulty relay supplying the seat motor
Faulty seat control module or body control module

Symptoms

Rear (tilt) section of driver seat does not move when control is used
Seat rear up sometimes works intermittently or only in one direction
Clicking or no sound from seat motor when attempting rear up
DTC B1655 stored in seat control / BCM with related seat movement faults
Possible burning smell or heat at connector if short/high current

What to check

Scan vehicle and note freeze-frame and any related DTCs (other seat or body codes)
Visual inspection of seat wiring, harness grommets, and under-seat connectors for damage or corrosion
Verify fuse and relay for power seat circuit are intact and seated properly
Operate seat switch while observing motor/actuator and listening for noise
Backprobe switch and motor connector to measure voltage and ground while operating the control
Measure resistance of the motor windings (with motor disconnected) and check for shorts to ground

Signal parameters

Expected battery supply to motor/switch when activated: ~11–14 V (varies with battery state)
Motor circuit ground should be near 0 V when commanded
Open-circuit (infinite) or very high resistance when switch open; low resistance path when closed
Typical seat motor current draw: low single-digit to low double-digit amperes under no-load; substantially higher if stalled (varies by vehicle)
No voltage or intermittent voltage indicates open wiring or faulty switch; constant voltage with no motor response indicates motor or mechanical fault

Diagnostic algorithm

Read and record DTCs and freeze-frame data from all modules; clear codes and attempt to reproduce to confirm persistence.
Perform visual inspection: check fuse/relay, connectors under the seat, harness routing through seat track and body grommets for pinching or wear.
With ignition ON, operate the rear up switch while observing connectors. Backprobe the switch input and output to confirm it sends voltage/ground when commanded.
Backprobe motor/actuator connector while operating switch. Verify battery voltage appears at the motor connector and that a ground return is present. If voltage present and motor does not run, suspect motor/actuator or mechanical binding.
If no voltage at motor, trace back toward switch and control module: check continuity of wiring and look for short to ground or open. Wiggle harness while operating switch to find intermittent faults.
Measure motor winding resistance with motor disconnected. Compare with specification or check for short to chassis ground. A very high or infinite resistance indicates open winding; near zero indicates short.
If motor and wiring appear good, test or substitute seat switch and/or seat control module (if possible) per manufacturer's procedures.
Repair or replace damaged wiring, connectors, switch, motor, or module as indicated. Ensure mechanical parts move freely before reassembly.
After repairs, clear codes, cycle ignition and operate seat through full travel multiple times to verify correct operation and that code does not return.